JP2002097291A - Method of dyeing plastics under high temperature and high pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of dyeing plastics under high temperature and high pressure to obtain colored plastics. SOLUTION: This method of dyeing plastics comprises the steps of dipping a plastic molding in a dyeing bath containing a disperse dye, dyeing under high pressure by setting the temperature of the bath in the range of 100 deg.C to 150 deg.C, and detaching unfixed dye on the surface of the plastic molding by washing or reductive washing to obtain a colored molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of coloring a plastic by dyeing it in a high-temperature and high-pressure dyeing bath.

[0002]

2. Description of the Related Art Conventionally, for dyeing plastics, a dyeing method in which a dyeing accelerator is added to a water-soluble dyeing solution, a dyeing method in a dyeing solution containing a solvent, or a plastic itself is used. By modifying, dyeing method, or a method of performing some treatment on the surface of the plastic before dyeing, or, for polycarbonate resin, by high temperature and pressure up to 100 ° C ~ 120 ° C,
For polyolefin resins, 90 ° C to 120 ° C
There was a method of dyeing by high temperature and high pressure.

[0003]

These have the following disadvantages. (A) a method of adding a dye accelerator to a water-soluble dye solution,
Alternatively, the method of dyeing in a dyeing solution containing a solvent is not suitable for practical use because the surface of the plastic is deteriorated and there is a risk of fire. Some plastics cannot be dyed by these methods. (B) Regarding the method of dyeing by high temperature and high pressure, polycarbonate resin and polyolefin resin are used.
Other plastics have not been studied or put to practical use. The present invention has been made to eliminate these disadvantages.

[0004]

A plastic molded product is immersed in a dyeing bath containing a disperse dye, and the dyeing bath is heated to a high temperature and a high pressure from 100 ° C. to 150 ° C. to be dyed for a certain period of time. After the completion, the unfixed dye on the surface is removed by washing or reduction washing, washed well with water, and dried to obtain a plastic having practical color fastness. The plastic in this case refers to plastics of polyphenylene sulfide resin, polyetherimide resin, polyetheretherketone resin, polymethylpentene resin, epoxy resin, copolymer resin of ethylene and ethylene tetrafluoride, and polyvinylidene fluoride. In the dyeing bath, not only disperse dyes, but also disperse dye dispersants, dye leveling agents, pH adjusters,
It is also possible to add a chemical such as an antifoaming agent. For washing after the completion of dyeing, a nonionic or anionic surfactant, and soda ash or caustic soda, a washing bath to which an alkaline agent such as aqueous ammonia is added,
Reduction cleaning is a reduction cleaning bath containing a reducing agent such as hydrosulfite and thiourea dioxide and a nonionic or anionic surfactant, and an alkaline agent such as soda ash, caustic soda, and ammonia water. And non-ionic or
The anionic surfactant is preferably of a type containing some alcohols. Further, as the disperse dye, a disperse dye having good light fastness can be used depending on the requirement of fastness after dyeing. The dyeing time can be arbitrarily selected, but is preferably from 20 minutes to 30 minutes. The temperature and the time of the washing and the reduction washing can be arbitrarily selected, but preferably the temperature is from 60 ° C. to 95 ° C. and the time is from 5 minutes to 20 minutes. The present invention is a method for dyeing plastic having the above-described structure.

[0005]

The plastic is immersed in a dye solution at 100 ° C. to 150 ° C. and dyed for 20 to 30 minutes. The disperse dye is dyed by diffusing into and penetrating from the surface of the plastic. Next, washing or reduction washing is performed for 5 to 20 minutes in a washing bath from 60 ° C. to 95 ° C. or a reducing washing bath to remove or decompose unfixed dye on the surface of the plastic. After that, wash and dry well.

[0006]

Embodiments of the present invention will be described below. (A) A bolt formed of a polyphenylene sulfide resin and having a length of 3 cm and a diameter of 9 mm was added to 1 g of a disperse dye Dyanix Blue ACE, a dispersant leveling agent for an anionic disperse dye, 0.5 g / l and a defoamer, Dyeing was performed at 130 ° C. for 20 minutes in a dyeing bath of 350 cc by adding 0.5 g / l. After dyeing, cool and wash. Next, the bolt was added with 1 g / l of thiourea dioxide, 2 g / l of a nonionic surfactant (including alcohols), and 1 g / l of soda ash, and added in a reducing washing bath of 350 cc to obtain 80 g. Wash at 15 ° C. for 15 minutes. After cooling, washing with water and drying. A bolt made of polyphenylene sulfide resin colored by dyeing blue was obtained. (B) A cut product made of a polyetherimide resin having a thickness of 3 mm and a length of 4 cm and a width of 1.5 cm was prepared by mixing 0.5 g of disperse dye Miketone Fast Black Z, 1 g / l of an anionic disperse dye leveling agent, and 1 g of an antifoaming agent. 0.5 g / l and add 100 cc
In a dyeing bath at 130 ° C. for 30 minutes.
After dyeing, cool and wash with water, then thiourea dioxide 1
g / l, non-ionic surfactant 2 g / l, soda ash 1 g /
immersed in 100 cc of the reduced cleaning bath to which
For 15 minutes. After completion, the resultant was cooled, washed with water, and dried to obtain a cut molded product made of a polyetherimide resin dyed black. (C) A hexagonal nut formed of polyetheretherketone resin and having a side of 9.5 mm and a thickness of 7.5 mm,
2 g of Dynix Black RSE and 1 g / l of an antifoaming agent were dissolved and dyed at 150 ° C. for 20 minutes in a dyeing bath of 150 cc. After dyeing was completed, it was cooled and washed with water. Next, this hexagon nut was subjected to reduction cleaning in the same manner as the reduction cleaning in (b) to obtain a hexagon nut made of polyetheretherketone dyed black. (D) Vertically 1.2 cm, horizontal 1 cm, depth 1.
An 8 cm, approximately 1 mm thick, cap-shaped molded product made of polymethylpentene was prepared using Dynix Black RSE 6 g,
Miketone Fast Black Z 5g, Dyanix Blue ACE 3g, 90% acetic acid 1g / l, and defoamer 1g
The dyeing | staining was carried out at 125 degreeC for 30 minutes in the dyeing bath which made 360 cc by adding / l. After staining,
Cooled and washed with water. This was subjected to reduction cleaning at 60 ° C. for 15 minutes in the same reduction cleaning bath as in (a). After completion, the product was washed well with water and dried to obtain a molded product made of polymethylpentene which was dyed dark gray. (E) A glass wool-containing epoxy resin plate having a length of 6 cm, a width of 3.5 cm and a thickness of 1 mm was placed on a Kayaron polyester yellow AULS 0.05 g, a disperse dye dispersant 1
g / l and 0.1 g / l of a silicone-based antifoaming agent were dissolved in a 100 cc dyeing bath.
Stain for 20 minutes at a temperature of ° C. After dyeing was completed, it was cooled and washed with water. The plate was weighed with 1 g / l of thiourea dioxide, 1 g / l of flake caustic soda, and 2 g of a nonionic surfactant.
By adding / l, reduction washing was performed at 100 ° C for 15 minutes in a reduction washing bath adjusted to 100 cc. After completion, the mixture was cooled, washed with water, and dried to obtain a glass wool-containing epoxy resin plate dyed yellow. (F) A ring-shaped molded product having a diameter of 3 cm, a thickness of 1 mm, and a width of 1.5 mm made of a copolymer resin of ethylene and ethylene tetrafluoride was subjected to resolin violet FBL 200% 15 g,
By dissolving 1 g / l of a disperse dye dispersant and 1 g / l of 90% acetic acid, 14 g
Stain for 30 minutes at a temperature of 0 ° C. After dyeing, cool and wash. Thereafter, in the same reduction washing bath as in (a), 90
Perform reduction washing at 15 ° C. for 15 minutes. After completion, the product was cooled, washed with water, and dried to obtain a molded product dyed in reddish purple. (G) A cylindrical molded article made of polyvinylidene fluoride having a diameter of 1 cm and a length of 1.5 cm was made with Dynics Yellow A
CE 1 g, disperse dye dispersant 1 g / l, defoamer 0.1 g /
1 in a dyeing bath at 100 ° C.
At a temperature of 20 minutes. After dyeing was completed, it was cooled and washed with water. Then, by performing the same reduction washing as in (a),
A molded article dyed yellow was obtained.

[0007]

According to the coloring by coating, the plastic can be colored without the necessity of mass production such as coloring of plastic with a large falling off of a painted surface or coloring of raw materials with pigments or the like.

Claims (1)

[Claims] 1. A method for dyeing a plastic under high temperature and high pressure.